Insulated Whole House Fan:

A great way to lower your cooling bills is to open up your windows and turn on a Whole House Fan to cool your house during the night when the temperatures are lower than in the day.  Many times your house can be cooled off to such a degree that you can close your windows in the morning and the temperature in your house will stay quite comfortable for most if not all of the day.  Many times adding central air conditioning to an existing house is too costly or impractical especially if it has radiant heat, and a Whole House Fan is a great and very effective alternative.